CN1906343B - Sewing machine - Google Patents

Abstract

A sewing machine, wherein holding members (46) and (48) for holding a thread hung on a needle thread take-up (17) to be swung at a position on the downstream side of the needle thread take-up and on the upstream side of the sewing needle fitted to a needle bar are provided in a sewing machine head. During the rest of operation of the sewing machine head, the movement of the thread on the downstream side of the needle thread take-up is stopped irrespective of whether the needle thread take-up is swung or not since the thread (T) is held by the holding members. The tip of the thread hung on the needle thread take-up is passed through the pin hole of the sewing needle fitted to the needle bar. When the needle thread take-up is swung, the hung thread is tensed or loosened according to the swing movement. However, since the thread is held by the holding members on the downstream side of the needle thread take-up in the sewing machine head in the rest of operation, the thread passed through the pin hole is not extracted from the pin hole even if the needle thread take-up is swung. By such a simple structure, the thread can be prevented from being extracted from the pin hole.

Description

sewing machine

technical field

The present invention relates to a sewing machine with an improved sewing thread holding structure on the head of the sewing machine at rest. sewing machine head on a multi-head sewing machine. In particular, when a multi-head sewing machine is used, and when only a part of the plurality of sewing machine heads is in operation and the work of the remaining sewing machine heads is at rest, a simple structure can be used to prevent sutures from coming out of the sewing machine heads at rest. A multi-head sewing machine in which the needle holes of each sewing needle come out.

Background technique

Conventionally, there is known a multi-head sewing machine having a plurality of sewing machine heads, the sewing machine head has: a needle bar that is driven up and down and contains sewing needles at the lower end; thread take-up lever; assembled on the same axis as the needle bar, a rotating body that can freely rotate around the axis of the needle bar; : Needle unit position, that is, the guider of the needle hole position on the fabric where the sewing needle penetrates), the sewing head can rotate and control the rotating body while corresponding to the moving direction of the fabric based on the prescribed embroidery data, and change the direction of the guide In order to keep the guiding direction of the rope-shaped member to the needle drop position of the sewing needle on the cloth to be correct, the cloth is sewed on the rope-shaped member in a flat seam manner. As this multi-head sewing machine with a plurality of sewing machine heads capable of sewing a cord-shaped member, there are known various multi-head sewing machines: a sewing machine with a plurality of sewing machine heads that can only sew a cord-shaped member, and alternately A sewing machine having a sewing machine head capable of sewing a cord-like member and an embroidery sewing machine head capable of carrying out normal embroidery, etc.

But, in the multi-head sewing machine of above-mentioned this type, sometimes use method can occur as follows: only need to make a part in a plurality of sewing machine heads work, and remaining sewing machine head does not need to work and is in working resting state. A common sewing machine main shaft is provided to pass through each sewing machine head of the multi-head sewing machine, and the rotation of the sewing machine main shaft moves the needle bar of each sewing machine head up and down to sew a string-shaped member to the cloth. Therefore, as mentioned above, in order to stop a part of the sewing machine head, it is necessary to use a known jump mechanism to cut off the transmission of the rotational drive of the sewing machine main shaft to the needle bar, so that the needle bar is in a position where it no longer follows the sewing machine main shaft. The "jumping state" that rotates and moves up and down. In this way, in the sewing machine head whose operation is stopped, it is preferable to stop the movement of the thread take-up lever at the same time. Especially in the sewing machine head that can be attached to the rope-shaped member, once the thread take-up lever swings in the work rest, it will cause the suture passing through the needle hole of the sewing needle to be pulled by the thread take-up lever to escape from the needle hole. This is because the holding member for holding the thread end of the suture thread behind the sewing needle in the embroidery sewing machine head is not arranged in the sewing machine head capable of sewing a string-shaped member. That is, since the sewing machine head that can sew a cord-shaped member has a rotating body that rotates around the axis of the needle bar, the holding member that holds the thread end of the suture cannot be arranged at a position such as the rear of the suture needle, and the suture cannot be placed. The end of the line remains. Thereby can cause the suture passing through the pinhole of the sewing needle to be pulled by the swinging thread take-up lever and deviate from the pinhole.

In order to solve the above-mentioned disadvantages, Japanese Patent Laying-Open No. 8-299639 describes a structure in which the thread take-up lever of the sewing machine head can be swung to rest during the work of the sewing machine head that can sew a rope-shaped member. sewing machine. According to the multi-head sewing machine described in this patent document, the flange portion of the thread take-up lever is supported on the sewing machine arm in a rotatable and axially slidable state on the thread take-up lever shaft arranged parallel to the main shaft of the sewing machine. At this time, the thread take-up lever repeatedly swings around the axis of the thread take-up lever shaft through the thread take-up lever driving arm, and the thread take-up lever driving arm is linked with the rotation of the thread take-up cam fixed on the sewing machine main shaft. A spring is arranged on the axis of the thread take-up lever shaft, and the applied force can make the gears of the flange part of the thread take-up lever and the mutual gear of the thread take-up lever driving arm always in the meshing position, so that the power is transmitted from the thread take-up lever driving arm to the Take-up lever. The push pin that can make the thread take-up lever slide is slidably supported on the arm of the sewing machine. When the push pin is slid manually, the push pin abuts against the thread take-up lever, and the thread take-up lever also slides together. Once the thread take-up lever slides, the gear engagement between the flange portion of the thread take-up lever and the thread take-up lever driving arm is disengaged, and the power transmission from the thread take-up lever driving arm to the thread take-up lever is cut off, and the thread take-up lever becomes at rest. At this time, while the thread take-up lever maintains a predetermined swing posture with respect to the thread take-up lever shaft, the push pin is kept in a slid state. Like this, when the work of sewing machine head stops, by operating pushing pin, thread take-up lever also stops, thereby can not appear the phenomenon that the suture that passes in the pinhole of sewing needle comes out.

As mentioned above, in the above-mentioned conventional technology, in order to prevent the suture passing through the needle hole of the sewing needle from coming out during the work stop of the sewing machine head that can sew the rope-shaped member, the swing of the thread take-up lever Also stop. Therefore, in order to stop the swing of the thread take-up lever, it is necessary to provide a cutting mechanism that slidably supports the thread take-up lever or has a push pin that slides the thread take-up lever, etc., and cuts off the power transmission from the main shaft of the sewing machine to the thread take-up lever. . However, once such a cutting mechanism is provided, not only the structure of the sewing machine head is complicated, but also the assembly on the sewing machine is complicated, and there are problems of cost increase and time-consuming.

Also, in the multi-head sewing machine described in the above-mentioned patent document, in order to stop the thread take-up lever, the operation of the push pin is manually performed, and when a plurality of sewing machine heads are at rest, each sewing machine head to be stopped must be operated separately. The push pin is not only cumbersome, but also considers that this operation may be forgotten, it is preferable to perform the operation automatically. However, in order to automatically push the pins of each sewing machine head, actuators for sliding the push pins must be provided on the respective sewing machine heads, and there is a problem that the installation of such actuators increases the cost.

Contents of the invention

In view of the above problems, it is an object of the present invention to provide a sewing machine with an improved sewing thread holding structure on the head of the sewing machine at rest. Another object is to provide a simple structure to hold the suture thread during the work stoppage of the sewing machine head capable of sewing the cord-shaped member, thereby preventing the needle from passing through the sewing needle even if the thread take-up lever is not stopped. Multi-head sewing machine with thread protruding from the hole.

The sewing machine of the present invention is provided with a sewing machine head having a needle bar which is driven up and down together with a sewing needle attached to a lower end, and a thread take-up lever which swings synchronously with the up and down driving of the needle bar, and is characterized in that , a holding member is provided in the sewing machine head, and the holding member is used to hold the suture passing through the thread take-up bar at a position downstream of the thread take-up bar and upstream of the sewing needle of the needle bar , when the operation of the sewing machine head is stopped by stopping the operation of the needle bar, the suture is held by using the holding member, so that the needle located on the thread take-up lever is Downstream suture action stops. Accordingly, it is not necessary to provide a dedicated cutting device for stopping the operation of the thread take-up lever, and the structure of the sewing machine head is simplified. In addition, since the holding member is disposed downstream of the thread take-up lever and upstream of the sewing needle of the needle bar, even if there is a rotating body around the sewing needle, it will not be an obstacle, and it is possible to provide a thread suitable for suturing. A simple thread holding structure for a sewing machine head for a belt-shaped member to be sewn.

The multi-head sewing machine of the present invention is provided with a plurality of sewing machine heads, the sewing machine head has a needle bar which is driven up and down together with the sewing needles installed at the lower end, and a thread take-up lever which swings synchronously with the vertical drive of the needle bar; assembled into A rotating body that is on the same axis as the needle bar and can freely rotate around the axis of the needle bar; The cloth movement direction of the sewing pattern data controls the rotation of the rotating body correspondingly, while changing the direction of the guider so that the guiding direction of the rope-shaped member to the needle drop of the sewing needle is kept correct, and the cloth can be stitched in a flat sewing manner. The rope-shaped member is sewn up, and it is characterized in that a holding member is provided in the sewing machine head, and the holding member is used to hold the suture passing through the thread take-up bar at the downstream position of the thread take-up bar. Hold, in the sewing machine head that is not working, by using the holding member to hold the thread, the movement of the thread located downstream of the thread take-up lever is stopped.

Thus, a holding member for holding the suture is provided downstream of the swinging thread take-up lever, and the suture is held by using the holding member during the work stop of the sewing machine head capable of sewing the string-shaped member, Regardless of whether the thread take-up lever swings or not, the suture motion located downstream of the thread take-up lever can be stopped. That is, in the work rest of the sewing machine head, the needle bar that is driven up and down together with the sewing needle installed on the lower end no longer drives up and down, but the thread take-up lever can swing. The front end of the suture passing through the thread take-up bar passes through the needle hole of the suture needle installed on the needle bar. When the thread take-up lever swings, the hanging suture is tightened or loosened correspondingly to the swing. Because in the sewing machine head in the work stoppage, the position of the holding member downstream of the thread take-up lever, that is, near the sewing needle, will The suture is held, therefore, no matter whether the thread take-up lever operates or not, the suture passing through the needle hole will not come out of the needle hole. Like this, adopt the present invention, only need be provided with in described sewing machine head in the downstream of thread take-up lever the retaining member that suture is used to hold and get final product, in the work rest of sewing machine head, even if the action of thread take-up lever does not Rest, the suture will not come out from the needle hole. In this way, it is not necessary to provide a dedicated cutting device for stopping the operation of the thread take-up lever, a multi-head sewing machine with a simple structure of the sewing machine head can be provided, and an increase in cost of the multi-head sewing machine can be suppressed.

As the most preferred embodiment of the present invention, it is characterized in that it has a presser foot body and a linkage mechanism, and the presser foot body is driven up and down synchronously with the up and down movement of the needle bar when the sewing machine head is in operation. , and when the work of the sewing machine head is stopped, the upper retracted position is no longer driven up and down. Suture retention through the thread take-up rod. In this way, when the operation of the sewing machine head is stopped, since the holding of the thread by the holding member and the retreating movement of the presser foot body to the retracted position are performed in conjunction with each other, it is not necessary to additionally provide an actuator for driving the holding member. Also, since the driving of the holding member is automatically carried out along with the retracting action of the presser foot body, even if the operator does not intentionally perform the driving operation of the holding member, the suture thread is held.

In this way, the present invention is applicable to a sewing machine head capable of sewing a string-shaped member, and the holding member for holding the suture is arranged so that: when the sewing machine head is at rest, the holding member is used to place the thread at the downstream position of the thread take-up lever Sutures are maintained. Thus, even if the thread take-up lever does not stop, the thread will not come out of the needle hole, so there is no need to install a disconnecting device in order to stop the thread take-up lever, which has the advantages of simplifying the structure of the sewing machine head and suppressing the increase in cost. Excellent effect.

Moreover, since the retaining action of the retaining member to the sewing thread is carried out in conjunction with the retracting motion of the presser foot body to the retracted position when the sewing machine head is at rest, it is not necessary to additionally provide an actuator for driving the retaining member, and Therefore, it is possible to prevent the phenomenon that the operator forgets to operate, which is easy to occur when the operator manually operates the holding member.

Description of drawings

Fig. 1 is a front appearance view showing an embodiment of a multi-head sewing machine according to the present invention.

Fig. 2 is a front view of a sewing machine head arranged in the multi-head sewing machine shown in Fig. 1 .

Fig. 3 is a left side view of the sewing machine head.

Fig. 4 is a sectional view of the left side of the sewing machine head.

Fig. 5 is a side view showing a part of the sewing machine head in section.

Fig. 6 is an enlarged side view of a part of the sewing machine head of Fig. 5 .

Fig. 7 is a partial enlarged view for explaining the suture holding operation.

Fig. 8 is a front view of the head of the sewing machine in an operating rest state.

Fig. 9 is a partial perspective view of the sewing machine head when the presser foot body is in the sewing position.

Detailed ways

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

First, the outline of the multi-head sewing machine of the present invention will be briefly described. Fig. 1 is a front appearance view showing an embodiment of a multi-head sewing machine according to the present invention. This embodiment shows a multi-head sewing machine having a plurality (eight in the figure) of sewing machine heads H capable of sewing a string-like member. In addition, in FIG. 1 , the front side corresponds to the front of the multi-head sewing machine at the actual position where the operator performs sewing work or the like.

In the multi-head sewing machine shown in Fig. 1, an upper frame 2 is arranged above the elongated sewing machine table 1 extending in the horizontal direction (X direction in the figure), and on the front surface of the upper frame 2, along the Sewing machine heads H are arranged at equal intervals in the longitudinal direction (X direction in the figure) of the upper frame 2 . Under each sewing machine head H, corresponding to each sewing machine head H, a shuttle bed 4 for supporting the shuttle 3 is provided at substantially the same height as the sewing machine table 1 . A sewing frame 5 for unfolding and holding a to-be-sewn object is placed on the top of the sewing machine table 1, and the sewing frame 5 is driven in the front, rear, left, and right directions by a drive mechanism (not shown) disposed under the table. Each sewing machine head H is provided with a common sewing machine main shaft 6, and the sewing needle of the sewing machine head H is driven to reciprocate up and down by rotation of the sewing machine main shaft 6. As shown in FIG. The sewing needle, in cooperation with the shuttle 3 rotating in the shuttle bed 4 , sews the object to be sewn that is unfolded and held on the sewing frame 5 .

Next, the sewing machine head H of the multi-head sewing machine shown in Fig. 1 will be described in detail. Fig. 2 is a front view of the sewing machine head H configured in the multi-head sewing machine shown in Fig. 1, Fig. 3 is a left side view of the sewing machine head H, Fig. 4 is a left side sectional view of the sewing machine head H, and Fig. 5 is a A partially cutaway side view of the sewing machine head H. The sewing machine head H shown in FIGS. 2 to 5 shows the state when the presser foot body 28 is at the sewing position. Next, the structure and operation of the sewing machine head H will be described with reference to FIGS. 2 to 5 . As shown in these figures, the sewing machine main shaft 6 passes through the sewing machine arm 7, and the left side of the sewing machine arm 7 is respectively provided with: a motor 22 for jumping away from the control needle bar 8; The motor 41 of the body 27; and the motor 49 for controlling the direction of the presser foot support body 27.

It can be seen from FIG. 4 that the needle bar 8 is mounted on the sewing machine arm 7 so that it can move up and down. The needle bar 8 has a hollow structure, and an inlet 9 for passing the suture T through the inside of the needle bar 8 is provided near the middle part of the needle bar 8 , and an inlet 9 for introducing a needle through the inlet 9 is formed at the lower part of the needle bar 8 . The suture T in the rod 8 is drawn out from the outlet 10 in the needle rod 8 . A sewing needle 11 is fixed to the lower end of the needle bar 8 , and a needle bar holder 12 for holding the needle bar 8 is fixed to a substantially middle portion of the needle bar 8 . Further, the needle bar 8 is driven up and down by the needle bar driving mechanism 13 using the rotation of the sewing machine main shaft 6 as a driving source. The needle bar driving mechanism 13 converts the rotation of the needle bar cam 14 fixed on the sewing machine main shaft 6 into the vertical movement of the lifting drive body 16 relative to the guide shaft 15 supported by the sewing machine arm 7 in the vertical direction. , the up and down movement is transmitted to the needle bar 8 via the needle bar frame 12 . The lift driver 16 is supported on the guide shaft 15 and is rotatable about its axis, and an engagement surface 16a having a predetermined length in the vertical direction is formed on a side of the lift driver 16 .

As shown in FIG. 4 , the flange portion (hub) 18 of the thread take-up lever 17 is supported so as to be swingable around the axis of the thread take-up lever shaft 19 which is fixed to the sewing machine shaft 6 parallel to the sewing machine spindle. on arm 7. That is, the thread take-up 17 repeatedly swings around the axis of the thread take-up shaft 19 by the thread take-up drive arm 21 that operates in conjunction with the rotation of the thread take-up cam 20 fixed to the sewing machine main shaft 6 .

As shown in FIG. 5, a drive arm 23 is fixed to the shaft of a motor 22, which is a jump control motor 22 for controlling the jump of the needle bar 8 in order to stop the operation of the sewing machine head H, that is, By cutting off the transmission of the rotational drive of the sewing machine main shaft 6 to the needle bar 8, the needle bar 8 is controlled to a "jump state" in which the needle bar 8 does not move up and down corresponding to the rotation of the sewing machine main shaft 6. The motor 22 is driven and controlled according to a specified jump-off signal, and the driving arm 23 can rotate counterclockwise in FIG. 5 . That is, in the vicinity of the top dead center of the needle bar 8, by rotating the drive arm 23 counterclockwise, the front end of the drive arm 23 presses the engagement surface 16a of the lift drive body 16, thereby making the lift drive body 16 Rotate around the axis of the guide shaft 15 . Like this, the needle bar frame 12 of needle bar 8 is released from lifting drive body 16 (referring to Fig. 4), and the transmission of the rotational drive of sewing machine main shaft 6 is cut off, so needle bar 8 becomes jumping-off state. When the drive arm 23 is held at the pivoted position, the needle bar 8 is in a continuous jumping-off state. In addition, the vertical length of the engaging surface 16a of the lifting driver 16 is set to be such that it always faces the front end of the driving arm 23 throughout the entire range of the vertical stroke of the needle bar 8 .

Returning to Fig. 4, a support tube 24 is provided on the outer periphery of the needle bar 8, and the support tube 24 can be raised and lowered relative to the needle bar 8 under the guidance of the inner peripheral surface of the fixed bushing 25 fixed to the bottom of the sewing machine arm 7. Rotatable around the axis of the needle bar 8 . A ring 26 is fixed to the upper end of the support cylinder 24 , and a presser foot support 27 is fixed to the lower end of the support cylinder 24 . The presser foot support body 27 is formed in a bifurcated shape, a vertically long key groove 27a is formed on one outer surface, and a presser foot body 28 is fixed to the other lower portion. A guide 29 for guiding a string-like member pulled out from a string winding frame 34 described later to a needle drop of the sewing needle 11 is fixed to the presser foot body 28 . A rotating cylinder 30 that can only rotate around its axis is provided on the outer periphery of the fixed bushing 25 . A pulley 31 is formed on the outer periphery of the upper end of the rotating cylinder 30, and a key member 32 engaged with the key groove 27a of the presser foot support 27 is fixed to the lower end. A rope winding frame bracket 33 is fixed to the outer periphery of the rotary drum 30, and a rope winding frame 34 is rotatably supported on the rope winding frame bracket 33. The rope winding frame 34 is preliminarily The roll contains a string-shaped member attached to the fabric with T-stitching.

Next, the mechanism for elevating and driving the presser foot support 27 will be described mainly with reference to FIGS. 2 , 5 and 6 . FIG. 6 is an enlarged side view of a part of FIG. 5 .

As shown in FIG. 2 , the front end portion (fork portion) of the drive arm 35 is engaged with the ring 26 of the support cylinder 24 so that power can be transmitted in the vertical direction. The drive arm 35 is mounted so as to be position-adjustable to a lift member 37 supported by a guide shaft 36 vertically arranged relative to the sewing machine arm 7 so as to be movable up and down. Further, an elevating member receiving body 38 is supported on the axis of the guide shaft 36 so as to be movable up and down. The lifting member 37 is supported by the lifting member receiving body 38 through the block body 39, and between the two, the lifting member 37 is applied to the block body 39 by the elastic force of the spring 40 arranged on the shaft of the guide shaft 36. (below) the pushing force.

As shown in FIGS. It is connected to one end of a rotating arm 44 rotatably supported on the sewing machine arm 7 . The other end of the rotating arm 44 is connected to the lifting member receiving body 38 through a link mechanism 45 . In this way, when the motor 41 is driven, the rotating arm 44 rotates back and forth, the elevating member receiving body 38 and the elevating member 37 ascend and descend along the guide shaft 36, and the supporting cylinder 24 and the presser foot supporting body 27 (presser foot body 28) are raised and lowered together by the driving arm 35. (Refer to Figure 2). As shown in Figure 6, during sewing, the motor 41 drives the rotating arm 44 so that it rotates back and forth between the position shown by the solid line in Figure 6 and the position shown by the dotted line, and the presser foot body 28 follows this One action is driving up and down between the bottom dead center shown by the solid line in FIG. 6 and the top dead center shown by the dotted line. When the sewing is finished and the work of the sewing machine head H is stopped, the rotating arm 44 is rotated to the position shown by the double-dotted line in Fig. 6 by the driving of the motor 41, and the presser foot body 28 retreats to the double-dot-dashed line in Fig. 6 The back-off position indicated by the line.

The bottom dead center of the presser foot body 28 may rise depending on the type of the belt-shaped member to be sewn. In this case, when the presser foot body 28 collides with the rope-shaped member, the lifting member 37 stops descending, and only the lifting member receiving body 38 descends against the elastic force of the spring 40, thereby allowing the bottom dead point to rise.

Next, the mechanism for holding the suture T along with the retraction operation of the presser foot body 28 to the retracted position shown by the two-dot chain line in FIG. 6 will be described. FIG. 7 is a partially enlarged view for explaining the operation of holding the suture T. FIG. Fig. 8 is a front view of the sewing machine head H, but different from Fig. 2, what this figure shows is when the presser foot body 28 is in the retracted position, that is, the sewing machine head H in the working rest state. Fig. 9 is a partial perspective view of the sewing machine head H shown in Fig. 2, showing the case where the presser foot body 28 is in the sewing position.

As shown in the aforementioned FIGS. 2 and 6 to 9 , an engaging piece 38 a is formed on the lifting member receiving body 38 . In addition, a rotation holding member 46 is provided on the sewing machine arm 7, and is rotatable downstream of the thread take-up lever 17. The rotation holding member 46 has an abutting edge 46b abutting against the engaging piece 38a (see FIG. 9 ). The rotation holding member 46 is pivotally supported by a support member 47 fixed to the front surface of the sewing machine arm 7 , and a rotation holding piece 46 a for holding the thread T is formed on the rotation holding member 46 . In addition, the rotation holding member 46 uses a torsion spring not shown to apply a clockwise rotation force as shown in FIG. 9 or FIG. 9 or the rotated position shown in Figure 2. Furthermore, a fixed holding member 48 is fixed to the sewing machine arm 7 . A fixed holding piece 48 a is formed on the fixed holding member 48 for sandwiching and holding the suture T together with the rotating holding piece 46 a of the rotating holding member 46 . The rotation holding piece 46 a and the fixed holding piece 48 a are provided at positions capable of holding the suture T introduced into the introduction port 9 of the needle bar 8 . In this way, the rotation holding member 46 is provided on the sewing machine arm 7 so as to hold the suture T threaded on the thread take-up lever 17 downstream of the thread take-up lever 17 , that is, at a position close to the sewing needle 11 .

The engaging piece 38a of the lifting member receiving body 38 is at the solid line position shown in FIG. 7 when the presser foot body 28 is at the bottom dead center, and is at the dotted line position shown in FIG. 7 when the presser foot body 28 is at the top dead center. line position. That is, during sewing, the engaging piece 38a moves up and down between the solid line position 38a and the dotted line position 38a' shown in Fig. 7 . During sewing, the rotation holding member 46 is in a state where the abutting edge 46b is blocked by the engaging piece 38a, and thus is held at the rotation position shown by the solid line in FIG. 7 . In this state, the thread T is not held, and the thread T is pulled out as the sewing progresses. And when sewing ends and after the work of the sewing machine head H stops, the engaging piece 38a moves to the position shown by the two-dot chain line 38a" in Fig. 7 along with the retracting action of the presser foot body 28. Thus, the contact The abutment and separation of the side 46b and the engaging piece 38a is separated, and the rotation holding member 46 is rotated to the rotation position shown by the two-dot dash line 46" in FIG. . In this way, the suture T is clamped and held by the rotation holding piece 46a and the fixed holding piece 48a. Therefore, the sewing thread T is not pulled out at the end of sewing and after the operation of the sewing machine head H is stopped.

Also, a shaft 50 is connected to the shaft of the motor 49 for controlling the direction of the presser foot support body 27, and the lower portion of the shaft 50 is rotatably supported on a base member 51 fixed to the sewing machine arm 7. A drive pulley 52 is fixed to the lower end of the shaft 50 , and a timing belt 53 is stretched between the drive pulley 52 and the pulley 31 of the rotary drum 30 . Accordingly, when the motor 49 is driven, the rotary drum 30 is rotated back and forth, and the directions of the presser foot support 27 and the guide 29 are controlled by the key member 32 .

The operation sequence when the multi-head sewing machine of the above-mentioned structure sews and attaches the string-shaped member will be briefly described below. In the multi-head sewing machine of the above-mentioned structure, when sewing the cord-shaped member, the thread T is passed through the needle hole of the sewing needle 11 of each sewing machine head H, and the cord on which the cord-shaped member is wound is installed. Winding stand 34. The suture T is drawn from the supply part not shown in the figure provided above the upper frame 2, and passed through the suture tension adjustment part at the upper part of the sewing machine head H, as shown in Figure 4, passing through the sewing machine arm 7 in sequence The upper thread guide 54 on the top, the middle thread guide 55 and the front end of the thread take-up lever 17 that are arranged on the front of the sewing machine arm 7 are then drawn from the lead-in port 9 of the needle bar 8 through the needle bar 8 from the lead-out port 10, and pass through the seam. Pinhole for needle 11. Put the rope winding frame 34 that is equipped with the rope-shaped member into the rope winding frame bracket 33, and simultaneously draw the rope-shaped member from the rope winding frame 34, and guide the through guide 29 to the seam. Needle drop on needle 11. When the start switch of the sewing machine is operated to make the sewing machine run, the sewing machine main shaft 6 rotates, and the needle bar 8 (sewing needle 11) is driven up and down, and the thread take-up lever 17 is swung simultaneously. The presser foot body 28 is driven by the motor 41 to be driven up and down between the solid line position and the dotted line position in FIG. 6 synchronously with the up and down drive of the needle bar 8 . The rotation of the rotating cylinder 30 is controlled by the motor 49, and the direction is controlled so that the rope winding frame 34 and the guide 29 are always on the front side of the sewing direction. And, the shuttle 3 rotates synchronously with the lifting drive of the needle bar 8 (sewing needle 11), and at the same time drives the sewing frame 5 in the front, rear, left, and right directions, so that the sewing frame 5 is stretched and held on the sewing object. Suture attachment of strip members.

Next, an operation sequence when only some of the plurality of sewing machine heads H are operated and the operation of the remaining sewing machine heads H is stopped will be described. In the sewing machine head H that is at rest, the needle bar 8 is driven by the motor 22 to continuously jump away, and the presser foot body 28 is retracted to the retracted position shown by the two-dot chain line in FIG. 6 under the drive of the motor 41. . Once the presser foot body 28 retracts to the retracted position, the engagement piece 38a of the lifting member receiving body 38 is separated from the abutment edge 46a of the rotation holding member 46, and the rotation holding member 46 rotates until the rotation holding piece 46a and the fixed holding member The rotation position shown by the two-dashed line in FIG. 7 where the fixed holding piece 48a of 48 abuts. In this way, the suture T introduced into the introduction port 9 of the needle bar 8 is clamped and held by the rotation holding piece 46a and the fixed holding piece 48a.

As described above, in the multi-head sewing machine of the present invention, when the operation of the sewing machine head H is stopped, the suture T introduced into the introduction port 9 of the needle bar 8 is clamped and held by the rotation holding piece 46a and the fixed holding piece 48a, so , In the sewing machine head H in the work rest, even if the thread take-up lever 17 swings the suture T will not be pulled and escape from the needle hole of the sewing needle 11. In this way, it is not necessary to specially provide a cutting mechanism for the swing stop of the thread take-up lever 17, the structure of the sewing machine head H is simplified, and the increase in cost can be suppressed. Moreover, since the thread T is held in conjunction with the retracting action of the presser foot body 28, there is no need to provide a drive source for holding the thread T, which not only suppresses the increase in cost, but also prevents the operator from being injured due to manual operation. The phenomenon of forgetting to operate.

The above-mentioned embodiment has shown the example that is applicable to the multi-head sewing machine that possesses the sewing machine head H that can only sew the cord-shaped member, and is also applicable to alternately possessing the sewing machine head H that can sew the cord-shaped member and the embroidery machine. Of the multi-head sewing machines using the sewing machine head, only the sewing machine head H capable of sewing a string-like member is used.

In addition, it is not limited to the form in which the suture T is held by the rotation of the rotation holding member 46, For example, the suture T may be held in another form such as sliding.

In each of the above-mentioned figures, the symbol 56 can certainly be a known needle plate fixed on the shuttle bed 4 .

Claims (5)

1. a Sewing machines possesses head of sewing machine, and this head of sewing machine has shank that drives up and down with the suture needle that is installed in the bottom and the thread take-up tension lever of swinging synchronously with the driving up and down of described shank, it is characterized in that,

Be provided with retaining member in described head of sewing machine, the suture that this retaining member is used for will passing in the position of the upstream of the suture needle of the downstream of this thread take-up tension lever and described shank described thread take-up tension lever is kept,

When the work of described head of sewing machine is stopped, described suture is kept, makes that with described thread take-up tension lever action the suture in the downstream that is positioned at this thread take-up tension lever being moved stops by using described retaining member,

Described retaining member includes the displacement member that selectively is indexed to primary importance that does not keep suture and the one position in the second place that keeps suture, this displacement member is positioned at described primary importance when described head of sewing machine is worked, this displacement member is positioned at the described second place when the work of described head of sewing machine is stopped

Described head of sewing machine is provided with pad body, this pad body when the work of this head of sewing machine and moving up and down of described shank synchronously drive up and down, and when stopping, the work of this head of sewing machine keeps out of the way retreating position above moving to, the action interlock that described displacement member and this pad body move to described retreating position and be positioned at the described second place.

2. Sewing machines as claimed in claim 1 is characterized in that, described retaining member be arranged on described shank the suture introducing port near.

3. Sewing machines as claimed in claim 1 or 2 is characterized in that, described head of sewing machine also has: be assembled into described shank on same axle center, can free cast-over bar the rotary body of axle center rotation; And rotate, the rope band shape is made the guider that member is directed to the needle downing position of suture needle with this rotary body, described head of sewing machine on one side with control described rotary body rotation accordingly based on the cloth moving direction of sewing pattern data, the direction that changes guider is kept correct so that the rope band shape makes the channeling direction of member to the pin place that falls of described suture needle, in flush joint mode can on cloth stitch attached this rope band shape member on one side.

4. Sewing machines as claimed in claim 1 or 2 is characterized in that, described Sewing machines possesses a plurality of described head of sewing machine.

5. multi-head sewing machine that possesses a plurality of head of sewing machine, this head of sewing machine has: the shank that drives up and down with the suture needle that is installed in the bottom; With described shank drive the thread take-up tension lever swing synchronously up and down; Be assembled into described shank on same axle center, can free cast-over bar the rotary body of axle center rotation; And rotate, rope band shape member be directed to the guider of the needle downing position of suture needle with this rotary body, this head of sewing machine is controlled described rotary body rotation on one side with based on the cloth moving direction of sewing style data accordingly, change the direction of guider so that the channeling direction of rope band shape member to the pin place that falls of described suture needle keeps correct, on cloth, stitch attached this rope band shape member in the flush joint mode on one side, it is characterized in that

Be provided with retaining member in described head of sewing machine, this retaining member is used for being kept wearing the suture of hanging described thread take-up tension lever at the downstream position of this thread take-up tension lever,

In the head of sewing machine that work is stopped, by using described retaining member suture is kept, the suture action in the downstream that is positioned at described thread take-up tension lever is stopped,

Have pad body and interlinked mechanism, when described pad body is worked at described head of sewing machine, synchronously drive up and down with moving up and down of described shank, and when the work of described head of sewing machine is stopped, the retreating position of keeping out of the way the top drives no longer up and down, described interlinked mechanism is kept will wear the suture of hanging described thread take-up tension lever along with the action of keeping out of the way of described pad body makes described retaining member interlock.

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